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Buffer Overflow in DBMS_REPCAT_INSTANTIATE in Oracle 9i

Name	Buffer Overflow Oracle DBMS_REPCAT_INSTANTIATE in Oracle 9i (up to 9.2.0.4)
Systems Affected	Oracle 9i
Severity	High Risk
Category	Buffer Overflow
Vendor URL	http://www.oracle.com/
Credit	Esteban Martinez Fayo (<argeniss>dot<com>)
Exploit	http://www.appsecinc.com
Date	01 May 2005 (V 1.00)

Details

Buffer Overflow in DBMS_REPCAT_INSTANTIATE. This package has EXECUTE permission granted to PUBLIC. Every database user can exploit this vulnerability and crash the database or execute arbitrary code. This vulnerability can be exploited via SQL Injection

Workarounds
REVOKE EXECUTE ON SYS.DBMS_REPCAT_INSTANTTIATE FROM PUBLIC FORCE;

Example
DECLARE
mynum NUMBER;
BEGIN
mynum := DBMS_REPCAT_INSTANTIATE.INSTANTIATE_OFFLINE('longstring','');
END;

or

SELECT DBMS_REPCAT_INSTANTIATE.INSTANTIATE_ONLINE ('longstring','') FROM Dual

Patch Information
Revoke the grant or apply the latest Oracle Security patches (e.g. CPU April 2004).

Definition Exploit
An exploit is a common term in the computer security to refer to a piece of software that take advantage of a bug or vulnerability leading to a privilege escalation or d.o.s. on a computer system.
Computer security experts are using exploit code to test if a patch is working properly.